How to have checkboxes checked by default using useFormik?

I have these components and I have 12 checkboxes in child component. I want to have them checked by default when the component loads. I can't do that. I can't use checked='true' as an attribute for my input because formik is controlling my input and it doesn't work well. Or I set checked attribute with some pre-defined values in checked array, but again it worked badly. I thought I probably can use useRef here to trigger onChange event of input to simulate changing checkboxes by checking them. something like this:

const ref = useRef();

useEffect(() => {
ref.current.change();
}, [])

and setting ref to the input. But this didn't work. How can I fix this problem with ref or something else?

    import {useFormik} from "formik";
    import CheckboxesComponent from "./CheckboxesComponent";
    
    const AddUserForm = ({handleShowForm, showForm, formTitle}) => {
        const cities = options.slice(1)
        const [textAreaString, setTextArea] = useState('')
    
        const formik = useFormik({
            initialValues: {
                tel: '', name: '', password: '', username: '', province: '', level: '', availableCities: '', city: '',
                checked: []
            },
            onSubmit: values => {
                console.log(formik.values)
            }
        })
    
        return(
            <form className='add-user-form' onSubmit={formik.handleSubmit}>
                <div className='form-flex'>
                   {/*other parts of form*/}
                </div>
                <CheckboxesComponent handleChange={formik.handleChange} />
            </form>
        )
    }
    export default AddUserForm

CheckBoxesComponent:

const fields = [
    {name: 'delNomad', label: 'حذف عشایر'},
    {name: 'editNomad', label: 'ویرایش عشایر'},
    {name: 'addNomad', label: 'افزودن عشایر'},
    {name: 'delDriver', label: 'حذف راننده'},
    {name: 'editDriver', label: 'ویرایش راننده'},
    {name: 'addDriver', label: 'افزودن راننده'},
    {name: 'rejectReq', label: 'رد درخواست ها'},
    {name: 'manualDeliver', label: 'تایید تحویل دستی'},
    {name: 'addWaterReq', label: 'افزودن درخواست آب'},
    {name: 'getExcel', label: 'دریافت فایل اکسل'},
    {name: 'seeingReport', label: 'مشاهده گزارش گیری'},
    {name: 'delReq', label: 'حذف درخواست ها'},
];

const CheckboxesComponent = ({handleChange}) => {

    return(
        <div className='checkboxes-part'>
            {fields.map((item, index) => {
                return(
                    <div>
                        <label>{item.label}</label>
                        <input type='checkbox' name='checked' value={item.name} onChange={handleChange} />
                    </div>
                )
            })}
        </div>
    )
}

export default CheckboxesComponent